Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello,

Got 2 pc at home, and on mine, I can't connect anymore to any account.
One the pc near mine, I can connect on every account.
Can you explain me the problem plz ?

I deleted WTF folder, it changes nothing cause I can't clic on ACCEPT, it's grey, and I just can clic REFUSE. Then the game closes.

A got back the WTF folder, same thing as before, it says always : Disconnected from server.

Thanks for help.

You can't scroll all the way down the text window to activate the accept button?